Q. 34.3( 143 Votes )

An electric bulb A. 100 W

B. 75 W

C. 50 W

D. 25 W

Answer :

The bulb parameters are as given below:

Power, P = 100W

Potential difference, V = 220V

Then Resistance, R = ?


This resistance of the bulb will remain constant i.e. 484

Now, when we operate this bulb on 110 V, then,

Power, P =?

Potential difference, V = 110V

And, resistance, R = 484

P =

P = = = 25 W

Thus, the correct answer is: (d) 25 W.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Ohm's LawOhm's LawOhm's Law43 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

Power of a lamp iAll In One Science

Show how would yoScience - Board Papers

Three 2Ω resistorXam idea - Science

The electric poweTogether With Science

An electric lamp Together With Science